18638733073 has 2 divisors, whose sum is σ = 18638733074. Its totient is φ = 18638733072.

The previous prime is 18638733053. The next prime is 18638733089. The reversal of 18638733073 is 37033783681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11843533584 + 6795199489 = 108828^2 + 82433^2 .

It is a cyclic number.

It is not a de Polignac number, because 18638733073 - 2²¹ = 18636635921 is a prime.

It is not a weakly prime, because it can be changed into another prime (18638733013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9319366536 + 9319366537.

It is an arithmetic number, because the mean of its divisors is an integer number (9319366537).

Almost surely, 2^18638733073 is an apocalyptic number.

It is an amenable number.

18638733073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18638733073 is an equidigital number, since it uses as much as digits as its factorization.

18638733073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 18638733073 in words is "eighteen billion, six hundred thirty-eight million, seven hundred thirty-three thousand, seventy-three".